Holding automatic gain control levels during read error recovery

Details Holding automatic gain control levels during read error recovery Holding automatic gain control levels during read error recovery

1997-05-30

2000-04-25

Faber, Alan

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Head amplifier circuit

360 53, 360 67, G11B 509

Patent

active

060551186

ABSTRACT:
An apparatus and associated method are disclosed for recovering user data from a data block in a disc drive in which user data are stored by way of a plurality of blocks on tracks of a disc, the blocks including data blocks in which the user data are stored in predefined increments. A head generates readback signals from the blocks and a read channel reconstructs the user data from the readback signals. An automatic gain control stage establishes a gain used to amplify the readback signal to a level suitable for use by the read channel. When an uncorrected read error is detected, the disc drive proceeds to read a previous block sequentially preceding the affected data block and sets the gain to a fixed value based upon the readback signals determined from the previous block. The fixed value of gain is then used to recover the user data from the affected data block.

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Finch and Moczarny, "Headerless disk formatting: Making room for more data," Data Storage Magazine, Apr. 1997, p.p. 51, 52, and 54, vol. 4, No. 5, Pennwell Publishing Co., Tulsa, Oklahoma.

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